Last updated: August 27, 2025
In May, Callao, Peru experiences a mild climate characterized by a maximum temperature peaking at 25°C (78°F) and an average temperature of around 19°C (66°F). Nights cool down to a minimum of 14°C (58°F), offering a comfortable range for both day and night activities. Dealing with a moderate humidity level of 83%, residents and visitors can expect a unique blend of warmth and moisture. Notably, May sees a light precipitation total of 9 mm (0.4 in), with rain likely appearing on just 1 day of the month, ensuring largely dry conditions for outdoor exploration.
In May, Callao experiences a noticeable shift towards cooler temperatures as the summer months come to a close. The minimum temperature dips to 14°C (58°F), while the average settles at a mild 19°C (66°F), and the maximum reaches 25°C (78°F). This month marks the transition into winter for the region, with daytime highs gradually decreasing compared to the warmer months preceding it. The consistent drop from the previous month's averages reflects the overall trend towards cooler weather, making May a comfortable time to explore this vibrant coastal city, as visitors can enjoy the fresh marine breeze and mild conditions.
In May, Callao, Peru experiences a significant decline in precipitation, with only 9 mm (0.4 in) recorded for the month, marking it as one of the driest periods of the year. This low total is accompanied by just one day of rainfall, illustrating the transition into a notably drier season. In contrast to the wetter months earlier in the year, such as January and February, which see more than 50 mm of rain and double-digit precipitation days, May stands out as a striking example of the region's shifting climatic patterns. As the city approaches the cool, dry winter months, the minimalist rain serves as a prelude to the extended dry spell that generally lasts into September.
As May arrives in Callao, Peru, the humidity begins to show a notable decline, averaging 83%—a dip from the consistently high levels of 89-90% seen in the preceding months. This transition marks a shift from the almost tropical dampness of early year, hinting at the upcoming dry season. Following May, a more substantial decrease in moisture is observed in June, when humidity plummets to 69%, and continues to drop throughout the winter months. This reduction not only suggests a more comfortable climate for residents and visitors but also highlights the distinct seasonal variation that characterizes Callao's coastal weather patterns. Overall, May serves as a pivotal month, bridging the wet season with the forthcoming drier months.
In May, Callao, Peru experiences a very high UV Index of 10, indicating a shift from the extreme levels seen in previous months. While the burn time increases to 15 minutes, residents and visitors alike should remain vigilant about sun protection, especially as the trend in UV intensity shows consistency in the high range throughout the year. From January to April, the UV Index peaked at 14, marking an intense sun exposure period, before slightly lowering in May and June, where it stabilizes between 9 and 10. As summer approaches, be prepared for returning extreme conditions in the latter months of the year. For those looking to stay informed and safe under the sun, detailed insights can be accessed at Callao UV Index.
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May shines brightly in Callao, Peru, with 331 hours of sunshine that marks a delightful peak in the early year. Following a steady ascent from 270 hours in January, the sunlight gradually builds, reaching its zenith in October with an impressive 340 hours. This trend of increasing sunshine hours not only highlights the region's vibrant climate but also enhances the allure of outdoor activities during this period. As the days lengthen and warmth flourishes, Callao embraces the brilliance of May, inviting residents and visitors alike to bask in its golden glow.
In Callao, Peru, the likelihood of sunny weather experiences a significant upswing in May, reaching 50%—a stark improvement from the earlier months of the year. As spring unfolds, May ushers in a more favorable climate compared to the gloomier January through April, where the sun made only sporadic appearances. The progression towards sunny days continues into June, although it dips slightly to 40% before rising again in the peak of winter. This trend not only highlights May as a standout month for sunshine seekers but also sets the stage for brighter days ahead, making it an ideal time for outdoor activities and exploration.
In Callao, Peru, the daylight duration exhibits a fascinating rhythm throughout the year. From January to March, residents enjoy a consistent 12 hours of daylight, creating a feeling of balance and continuity. However, as the seasons shift into April and May, this daylight begins to taper off to 11 hours, signaling the onset of cooler months. This trend continues through June to August, when daylight remains steady at 11 hours. Fortunately, a subtle shift occurs in September, bringing back 12 hours of sunlight, which persists through October and November before returning to the familiar 12-hour pattern in December. Overall, Callao experiences a seamless transition between longer and shorter days, harmonizing with the natural cycle of the seasons.
In May, Callao experiences a noticeable increase in wind speed, averaging 2.6 m/s (6 mph), as the coastal breezes begin to strengthen. This uptick is part of a broader trend that sees wind speeds gradually rising from the gentler days of early spring. Following the relatively calm months of January through April, May marks the transition into a breezier season, setting the stage for the strong winds that will dominate in June and July. As the year progresses, these winds continue to build, peaking in late winter, creating a lively atmosphere perfect for outdoor activities and exploration. Overall, May serves as a refreshing prelude to the windier months ahead, inviting both locals and visitors to enjoy the invigorating climate.
Weather in Callao varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Callao, focusing on differences in temperature, rainfall, humidity, and UV levels.
May and January present contrasting weather patterns, showcasing the transition between seasons. In May, temperatures range from a mild 14°C (58°F) at night to a pleasant average of 19°C (66°F) during the day, peaking at 25°C (78°F). Precipitation is minimal, with only 9 mm (0.4 in) falling over just one day, and humidity is relatively high at 83%. In contrast, January offers warmer temperatures, with nighttime lows of 17°C (64°F) and daily averages reaching 21°C (71°F), topping out at 27°C (81°F). However, January is significantly wetter, with a total of 47 mm (1.9 in) of rain over about 15 days, resulting in higher humidity at 89%. For more details, you can check Callao weather in January.
Comparing the weather between May and February reveals notable differences. In May, temperatures range from a minimum of 14°C (58°F) to a maximum of 25°C (78°F), with an average temperature of 19°C (66°F). This month experiences relatively low precipitation, averaging just 9 mm (0.4 in) over 1 day, paired with a humidity level of 83%. In contrast, February is warmer, with temperatures ranging from a minimum of 18°C (65°F) to a peak of 28°C (82°F), and an average of 22°C (72°F). However, February is also significantly wetter, receiving 53 mm (2.1 in) of rainfall across 12 days, along with a slightly higher humidity of 89%. For a more detailed look at February's climate, you can check out Callao weather in February.
In comparing the weather of May and March, it is evident that May tends to be milder, with average temperatures ranging from 14°C (58°F) to 25°C (78°F) and significantly less precipitation, totaling only 9 mm (0.4 in) over just one day. This contrasts with March, where temperatures are generally warmer, averaging between 17°C (64°F) and 27°C (81°F), but it experiences higher precipitation levels of 50 mm (2.0 in) spread across 14 days. Additionally, March's humidity is slightly higher at 90%, compared to May's 83%. For a more detailed look at March weather, you can visit Callao weather in March.
In comparing the weather of May and April, we see a slight variation in temperatures and precipitation patterns. May experiences a minimum temperature of 14°C (58°F) and an average of 19°C (66°F), which is a bit cooler than April's minimum of 15°C (60°F) and average of 20°C (69°F). The maximum temperatures are relatively similar, with May peaking at 25°C (78°F) and April reaching up to 26°C (79°F).
While May sees only 9 mm (0.4 in) of precipitation spread over just 1 day, April is notably wetter, with 18 mm (0.7 in) over 5 days. Additionally, humidity levels are slightly higher in April at 89% compared to May's 83%. For a more detailed look at April's weather, you can check Callao weather in April.
In comparing the weather of May and June, May tends to be slightly warmer with average temperatures ranging from a minimum of 14°C (58°F) to a maximum of 25°C (78°F), while June’s temperatures are a bit cooler, with a minimum of 15°C (59°F) and a maximum of 21°C (71°F). Although both months experience similar precipitation levels of approximately 10 mm (0.4 in), May sees one day of rain, whereas June is dry with no recorded rainy days. Additionally, humidity levels are higher in May at 83%, compared to June's lower humidity of 69%. For more detailed insights about June weather in Callao, you can visit Callao weather in June.
In May, temperatures range from a minimum of 14°C (58°F) to a maximum of 25°C (78°F), with an average of 19°C (66°F). The month experiences higher humidity at 83% and a modest amount of precipitation, totaling 9 mm (0.4 in) over just one day. In contrast, July presents milder weather with temperatures fluctuating between a minimum of 14°C (57°F) and a maximum of 21°C (69°F), averaging 17°C (63°F). Notably, July is drier, recording no precipitation despite slightly higher overall rainfall at 11 mm (0.4 in) compared to May. Humidity drops significantly to 56%, indicating more comfortable conditions. For more detailed information, check Callao weather in July.
May and August present distinct weather patterns. In May, temperatures range from a minimum of 14°C (58°F) to a maximum of 25°C (78°F), with an average of 19°C (66°F). The month experiences a fair amount of humidity at 83%, accompanied by light precipitation of 9 mm (0.4 in) over just one day. In contrast, August offers cooler temperatures, with a minimum of 14°C (57°F), an average of 17°C (62°F), and a maximum of 20°C (69°F). Notably drier, August sees no days of rain and slightly lower humidity at 50%, with total precipitation remaining at 10 mm (0.4 in). For more detailed weather information, you can check Callao weather in August.
In May, weather conditions are generally milder, with average temperatures ranging from a minimum of 14°C (58°F) to a maximum of 25°C (78°F) and higher humidity levels at 83%. Precipitation is minimal, with only 9 mm (0.4 in) over just one day. In contrast, September sees cooler temperatures, with a minimum of 14°C (57°F) and a maximum of 20°C (69°F), along with a lower average of 17°C (62°F). Although September has a similar level of precipitation at 10 mm (0.4 in) over one day, the humidity significantly drops to 53%. For more information about the weather conditions in September, you can refer to Callao weather in September.
In May, the weather is generally warmer with average temperatures ranging from a minimum of 14°C (58°F) to a maximum of 25°C (78°F), while October experiences slightly cooler conditions with averages from 14°C (58°F) to 21°C (71°F). Both months see minimal precipitation, with May having 9 mm (0.4 in) over just one day and October seeing a marginally higher 10 mm (0.4 in) across two days. Additionally, humidity levels are higher in May at 83%, compared to a more comfortable 68% in October, making the latter month feel less muggy. For more detailed insights, you can check Callao weather in October.
May and November offer comparable weather conditions, with both months experiencing mild temperatures and similar levels of precipitation. In May, the temperatures range from a minimum of 14°C (58°F) to a maximum of 25°C (78°F), while November has a slightly warmer range of 15°C (59°F) to 23°C (74°F). Both months see approximately 9 mm (0.4 in) of precipitation, though November typically has two days of rain compared to just one day in May. Humidity levels are fairly consistent, with May at 83% and November slightly lower at 81%. For a more detailed look at November weather, you can visit Callao weather in November.
May typically features mild temperatures, with a minimum of 14°C (58°F) and an average of 19°C (66°F), reaching a maximum of 25°C (78°F). The month experiences low precipitation, averaging just 9 mm (0.4 in) over about 1 day, and boasts a humidity level of 83%. In contrast, December brings slightly warmer temperatures, with a minimum of 16°C (62°F) and an average of 20°C (68°F), while still peaking at 25°C (76°F). However, it sees increased rainfall, totaling 17 mm (0.7 in) across approximately 3 days, and a humidity level of 87%. For more information on December weather in Callao, check out Callao weather in December.
As May rolls into Callao, the weather offers a refreshing transition into cooler, yet pleasant conditions compared to the warmer months preceding it. With an average temperature of around 19°C (66°F), residents and visitors alike can relish in mild days complemented by low humidity levels that offer a break from the summer heat. The month experiences minimal rainfall, just a single day of light precipitation, making it an ideal time for outdoor activities along the beautiful coast. This unique blend of comfortable temperatures and dry days distinguishes May as a delightful prelude to the coming cooler season. For more detailed insights on seasonal changes, check out Callao Climate.